Crafting and gathering craft mats CAN really add depth and fun to the game. Giving players a but more control over obtaining gear can be satisfying and help them replace really old, outdated gear if they just can't seem to get lucky with drops from mobs.

I will say this though: please don't half-ass it. It'd rather there be no crafting than a lame, unsatisfying crafting system that results in nothing but bag clutter for mats you rarely ever use.